Note.N number of participants, M mean, SD standard deviation. aVMBO: preparatory secondary vocational education. bMBO: secondary vocational education. cReadiness to change alcohol consumption was assessed through one item asking the participants
which statement applied best to them. Participants were considered to be ready to
change alcohol consumption when they selected “I do not drink alcohol anymore” or
“I want to reduce drinking alcohol within the upcoming six months” or “I want to reduce
drinking alcohol within the upcoming month” or “I have already reduced drinking alcohol,
but less than six months ago”. dDrinking > 7 or 12 (girls/boys aged 15–16 years) or 14 or 21 (females/males aged 17–20 years)
glasses of standard units of alcohol per week and/or drinking 5 or more glasses of
standard alcohol units per occasion at least once per month for boys and girls aged
15–16 years and at least once per week for males and females aged 17–20 years (= binge
drinking).